Thus, the Kähler potential stabilizes \(X\)  at the origin. If one decides to apply an RG approach here and resum the logs one can see that this leads to a Landau pole and creates problems for the physics of this model at large \(X\) . To avoid the Landau pole and make the ERG approach consistent, one has to make \(m_X^2\)  tachyonic. This was the choice in [1]} where, to avoid the Landau pole at all \(X\)  and based on the ERG equations, the authors studied a theory that is unstable at small \(X\) .
